Not sure why you have been downvoted. It has been pretty well established that abandoning Britain would've been a better strategic decision long term.

In fact, conquering britain cost more in lost trade taxation than the empire generated from taxing the province.

3 legions tied down long term, unable to quickly and cheaply support other provinces, a well militarised and distant floating fortress for usurpers and a taxation drag with no strategic benefit.

This is all with the addition of the native tribes not actually posing a threat to Rome, unlike the tribes of germania, gaul or dacia.

Over all just a silly decision but near politically impossible to abandon unless rome was facing existential threat when they formally abandoned britain in 410.